Continuously variable hydrostatic transmission having swashplate-mounted cylinder blocks
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United States of America Patent
Stats
-
Jul 2, 1996
Grant Date -
N/A
app pub date -
Mar 31, 1995
filing date -
Mar 31, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydrostatic transmission includes wedge-shaped swashplate operatively positioned between a hydraulic pump unit driven by an input shaft and a grounded hydraulic motor unit to accommodate pumped exchanges of hydraulic fluid between the units. The swashplate, drivingly coupled to an output shaft, is angularly adjustable about a pivot axis oriented in intersecting, orthogonal relation to the output shaft axis to infinitely variable transmission ratios. Pilot bearings, mounted by the swashplate, support cylinder blocks of the hydraulic pump and motor units for nutating motions centered on the swashplate pivot axis to minimize the resultant moment on the swashplate. Piston rods in the hydraulic pump and motor units are oriented in outwardly flared, acute angles to the output shaft axis to expand the range of permissible angular adjustment of the swashplate by a ratio controller.
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